Automatic electromagnetic switch.



i0. F. FOHSBERG. lAuoM/Tc ELEcTRoMAGNETIc swncH.

rAl'mlcnlwlou msn uma, larsl 1 ,27 9, 854.- Patented Sept. 24? 1918..'

UNITED STATES oscar. r. nonsense, oF'roNKEns, NEW

PATENT OFFICE.

YORK, A'SSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK,N. Y., A CORPORATION OF NEW YORK.

AUTOMATIC ELECTROMAGNETIC SWITCH.

Specification o! Letters Patent.

Patented Sept. 24, 1918.

Application filed December 8, 1916. Serial No. 135,777.

To all whom it mfzy/fco-nccfmr:

Be it-known that'l, OSCAR l?. I1`onsnnim, a. Icitizen of the UnitedStates, residing:` at Yonkers, `in tb'e county of VVcstchgstfcr andState of New York, have inventwl certain Inew and useful Improvementsyin Autonmtic Electromagnetic Switches. o1' whiclrtbe following is afull, clear,foni:ise, land exact description. v i

This invention rvlnles to automatic "elec-v tromagnetic switches.

The object of the invention is to provide a rotating switch of thecharacter described to quicklykind effectively connect and disconnect circuits or parts ofjcircuits by a uniform str-p oradvance movement, and'which shall automatically'return to al'norrnal position .wl-lenitsrestoring 'circuit'js closed.-

Tbe `switch is providediwitha pluralitytion of a. switch'enibodyiiig the'principles of this invention.y y v i The structure and' operatingdetails of the switch will be more readily understoodV from aconsideration ofthe followin'glde'seription: .A yokt ir Ufshaped member1', which may be a metaA punching', supports' on brackets 2 brush shaft,a A channllrplate 4 is fas- Aals tened by its-sides across the open endofthe ke 1 andssupports' one end of the magnet il whose otherl` end isfastened to the-'closed end 5 of the yoke1., ,Tbe arn'iature 6 of magnetM lisa .fiat plate pre-vided with lugs 7 -which areb'ent atri h.'-angles 'on either side d A 4.. holes in, these lugs? and in lugs 8 atthe botof the bottoni of tie armature. Through 4tom of the open end 0fyk? 1 ril-ns the'fliin e `9., pivotally supporting;

the armature. forward movement o .the amature is restricted 'by the endso fk'tlie yoke 1 .a4 inst which it restgwhen pulled up. Its ack wardmovement islimited by the pin 10 projecting from tbe-plate 11,

At the bottoml of its closed'end a portion oftheyoke 1 is bentto-,form'theprojection 12.' 0n the lower side of this are piled a lsmall `Zbar 13 and contact springs 14, I5, '16 and 17. Thecontactsprings are separated by layers of insulation, and the pile 'may beheldtogether by a screw 18. A

sprinff 19 is stretched from the lower arm of Z-liar 13 to a projection2() on back lug 7 0f armature 6 to normally holdithe arnnv tureretracted. A portion of the armature is bent to forni the lever 21, atthe end of` which is a collar of insulating material This collar restson one endof spring 1.3, and when the armature is pulled up breaks theContact between springs 14 and 15.

AThe brush shaft El carries a collar` 23 which muy be rigidly attachedby a set screw or other means, not shown. The back end of the collar isenlarged into a diskin whose edge teeth 24 are cut. Alpawl 25 is pivotedon a pin '26 which is carried by-lugs 27 ,of armature 6. A spring 28holds the pawl in engagement with-teeth 24,.while a lug 29, carried by'the armature, serves to "prevent the fall ofthe pawlbeyondthe control ofspring 28 in case of'weakening of-the spring. An arm 30 is bent from theclosed end' of yoke 1 into a position such thatitaw-illlimit the forwardmovement ofthe pawl25 upon the energization of the magnet M: to thevamount necessary to rotate the brush shaft 3 through an arc subtended bya sin'gle tooth 24. A spring 45, fastened on the arm 30, rests on theteeth 24 and prevents retrograde movement ofthe brush shaft.

On thebrush shaft 3 behind collar 23 is a collar 31 also ri idly held tothe shaft. Pressed between co lar 3l and a nut 32 are two strips ofinsulation, and between these strips is a thin metal disk which carriesbrushes 33. ln the embodiment of the invention herein disclosed, thesebrushes are positioned at opposite ends of a diameter of the disk. andare two in number, but any desirable number could be provided. A metalfeed plate 34, extending-overan-arc of approximately 180 degrees, is'insulatedly mounted on/the rear bracket 2 in a position such that thelower brush 83 will wipe over it and that one of the'brushes will 'bei'ncontact with it in every position of thelawitch. The o'ther brush willwipe over the contacts 35, which are arranged in a `semi-circular bank,and will rest squarelyNona -lcontact whenever the switch is va'treS-t;Thus vthe feed plate will be successiilyiconnected through the brushesto each contact as the brush shaft is ,rotated in response to the `36 toa -plate 37. The 'plate 37 may be a 16 and 17, and normal position isreached.

"r'ests at `the righthand upper end of the metal punching, and has itsupper` end drawn so as to resent an annular rim lSvwhose `t'ront guriaeois parallel to the plane of the brush disk and brushes Il?. The contacts35 are clamped between layers of insulation to the rim 38 by an annularstrip 39. 'lhe ends of theI contacts may be bent baek over the edge ofthe rim 38,asshown in Fig. 2, for convenience in connecting theterminals of the circuitsI associated ther with. The terminalconiTectedwith the feed plaie. 2H may be attached to ththig\ 4`0.provided on the feed plate for that purpose.

bell-crank lever 4-1 set just inside the front. side of the yoke 1 hasat its lower end a yoke 42, the rear end of which carries a lug 46. Thelever is pivoted on the pin 9, which runs through the lug;` 46 and thelower end of the, lever itself. The yoke 42 carries on itsl lower side apiece. of insulation which rests ou the. contact spring 16. This spring16 is stift" and by its pressure on the Yoke 42 holds the lever t1against a projection 43, which hns been made by cutting outand bendinginward a piece of the yoke 1.- A cam 44 tixed at the front end' of thecollar 23 on lfii'iish shaft'l will; by its bent portion ateither end,engage the lever 41 twice in each revolution of' the brushes; W'hen soengaged the lever 41 will press the spring 16l vdown so as to connectit. withv spring 17. The no rmal position of the switch is that. inVwhich one brush rests on lthe last conta'et to the left.- and the otherfeed plate. 'l`he cam 44 is adjusted so that when vthe ln'usheslareinthis positionfit will engage lever l1 and close the contact. sin-ings16 and 17.

`The switch as a. -wholefmay be'mounted on a frame.' not shown,by-attaching to it the plate 37 in anysuitablemanner, and.

when so mountedtheyoke 1' and all parts carried by 4It -maydm readilyremoved by sinlplytakmg out the screws Elli which hold tho platel l1l tothe. plate 37, such.removalI not, necessitatinganydisturlmnee of the'rontact bank or its .associated terminals.

'lbo switch may be used as; a -eounter jor register, its magnet. beingintermittently eliergtzed m accordance wlth .;the number of,

eont'aets it. is desired to bareiswopt over before. a circuit. iscompleted from the -t'eedA plato termliual to some line, terminatingr ina t-on'taet spring. when thefdesired contact.

is reached. the eireu-t' is broken outside the switch andtlubrushesnuike the desired connection. To restore. the switch tn normal4 when itsuse. is' o\'er.t. only necessary to {twapply a source of current lo tbewinding of thelmagnet. includingr the contact sprin, n-:.` l-lvand l5 iuthe clremt.

',lhe magnet will theninterrupt tsvown circuit. stepping the brushesaround until cani closes springs To stop the brush in this position anywellknown device may beemployedto operate upon the closure of the.springs 16 and 17, and break the circuit through the magnet M. lVhatis=claimed is: I

1. The combination in a switch mechanism of a U-shaped `supportingmember a series' ofcontacts, a feed plate, a rotatable brush shaftmounted on said supporting member, a plurality of lu'ushescarried hysaid shaft arranged to engage and make connection between the. feedplateI and the successive contacts ofv said series, each of`saidubrnshes having a normal position, an electromagnet mounted betweenthe arms of said su pportighieinber, an armature therefor pivo'tallymom'itedbetween the arms of the supporting member, means carried by saidarmature for operatingfsaid,A brush shaft, a set of spring contacts,"and 'means controlled by' thel brush' shaft when'v s`aid` brushes are in'their normal positions for actuat-ing'sairt contactset. l 2.The-combinaition in 'a switch mecha# nism`- of' a U-shaped supporting"member, a series of contacts, a feed plate, a"i'otatable member, alplurality of brushes `carried by said shaft: arranged to engage-and''make connection between the fectl striand the wntacts of said series,each 'df' said brushes having a normal position, anelect'roniagnetmounted `between -the"arnisf`of saidsupport- .ingmemlu-r, a pivotjpin-tixed tb' the'opposite arms of the supporting'mmle'an armature for,-aid electromagnetmounted pn said pivot pin,'means carriedby saidarmature for operating'the, brush sh'aft, a set of spring contacts, alever" for operating said contact.' ut mounted on said pivot pin, andmeans for actuatil'l'g,r said sleiter when an one," nf saidbrushes is initsnrm'al 'position.l

The combination'in-:answiteh mecha, uism ofa.. U-shaped,supportingmember, an arcuate. series-of contacts, an: arcuate feedmember, a :rotatable .brush shaft; supported by. thc-opposite arms ofthe Usl'a'ped member, brushes on4 said shaft'arranird to engage and makeconnection between the feedj member and the contacts of said series,said brushes -eaeh :having-a norlna-l position,` ani'electronmguet..mounted outhe` U-shapedmenjlher between the armsfthereof,a. pivot'. pin.supportedacross the free ends of said arms, au-arnmturelor .the electromagnetearried b ysaid pivot pin,4 means on said`armature fluoperatiug the brush Shzrftga rontaetl set-'i a 'levermounted on saidpivotfi` pin 4and arujangcd to aetliate said co'ilt-actj,

set, and uittins including a cam senrediri ilsaid brushes reaches itsnormal i susy L The combination in a switch mechanism of a U-shapedsupporting member, a series of contacts'7 a feed plate7 a rotatablebrush shaft supported by the opposite arms of the U-shaped member,brushes on said shaft. arranged to engage and make connec tion betweenthe feed plate and the contacts of said series, said brushes each havinga normal position, an electromagnet mounted on the U-shaped memberbetween the arms thereof, a pivot pin supported across lthe arms ofsaid` U-shaped member, an arma ture for said electromagnet mounted onsaid pivot pin, means on said armature for operating the brush shaft,sets ot' spring contacts, means on said armature for actuating one ofsaid contact sets at eacli energize.- tion of the electrolnagnet, abell-crank lever pivoted on said pivot pin and arranged to actuateanother of said contact sets,-and means carried by the brush shaft foroperating the bell-crank lever when each of said brushes reaches itsnormal position.

5. The eoi'nbination in a switch mecha; nism of a U-shaped supportingmember the. armsof which are )rovided with parallelly extending integralbrackets, a series of stationary contacts, a brush shaft rotatably.supported by said brackets, brushes on said shaft arranged to eo cratewith said con tact series, each brush aving a normal position, astepping magnet mounted on the U-shaped member between the arms thereof,anV armature therefor pivoted to the free ends of said arms, means onsaid annatu're for operatin the brush shaft, a Contact set, a bell-cranklever pivoted between said arms and arranged to actuate said contactset, and a cam attached to the brush shaft for operating said level'"when any one of Said brushes 1s in its normal position.

In Witness whereof I hereunto subscribe my name this 7th day of DecemberA. D., 1916. a

OSCAR F. FoRsBERG.

